Reversed-field permanent-magnet focusing system for multi-beam millimeter wave traveling-wave tubes and manufacturing method thereof

Abstract

The invention discloses a reversed-field permanent-magnet focusing system for multi-beam millimeter wave traveling-wave tubes, which consists of an electron gun end face (1), first magnetic field rectifiers (2), a first peak generation pole shoe (3), a magnetic field reversal pole shoe (4), a second peak generation pole shoe (5), second magnetic field rectifiers (6), a vacuum sealed case (7), a collector end face (8), first permanent magnets (9) and second permanent magnets (10). The reversed-field permanent-magnet focusing system for the multi-beam millimeter wave traveling-wave tubes rectifies magnetic fields on the left and right sides of a magnetic system by the first and second magnetic field rectifiers (2 and 6) so as to reduce a transverse magnetic field without influencing flux rates of electron beams, and simultaneously solves the problem of large volumes of the permanent magnets of a uniform-field permanent-magnet focusing system with large gain due to the applicability of the plurality of first and second permanent magnets (9 and 10) with small volumes to the focusing system.

Description

technical field [0001] The invention belongs to the field of microwave vacuum electronics, and in particular relates to a millimeter wave multi-beam traveling wave tube reverse field permanent magnet focusing system and a manufacturing method thereof. Background technique [0002] As a vacuum microwave power amplifier, traveling wave tubes have the advantages of wide frequency band, large gain, high efficiency, and large output power. They are widely used in various civil and military microwave transmitters. [0003] With the gradual crowding of centimeter-wave multi-beam traveling wave tube users, the research and development of millimeter-wave multi-beam traveling wave tube technology has attracted attention for many years. Due to the "commensurability" between the size of conventional microwave devices and the working wavelength, for the design and manufacture of millimeter-wave multi-beam traveling wave tubes, the millimeter-wave multi-beam The radial size of the travel...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this magnetic system is that the volume of the permanent magnet in the permanent magnet focusing system becomes very large with the increase of the length of the slow wave system of the traveling wave tube, which is not conducive to the miniaturization of the traveling wave tube

The length of the TWT slow-wave system depends on the gain of the tube design, so it is generally not suitable to use this permanent magnet focusing system when the gain of the millimeter-wave multi-beam TWT exceeds 40dB.

Images